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 # ExtendedGetSourceRatio 

 Last update: 17.07.2025 

## Description

Gets the value of one of the sources of an extended or a spectral map.

In case of error, returns -1 if:

- the map is neither an extended nor a spectral map
- no source in the map
- iSource >= number of sources in the map
- iSource 0

## Syntax

*object*.ExtendedGetSourceRatio(int iSource) As Double

- *object*: Virtual Photometric Lab or Virtual Human Vision Lab object
- *iSource*: index of the source